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Abstract

A sensor is described for which interference measurements of the
phase delay between two propagating modes of different orders in a slab
thin-film waveguide are used as the sensing technique. The basic
building block of the sensor is a polymer film doped with an indicator
dye such as Bromocresol Purple. The modes of two orders such as
TM0 and TM1 are simultaneously excited in the
light-guiding film with a focusing optics and a prism coupler. The
modes are decoupled from the film and recombined to produce an
interference pattern in the face of an output optical fiber. The
sensitivity of the sensor to the ambient temperature change is
1.5 °C, and the sensitivity to NH3 is 200 parts in
106 for one full oscillation of the signal.

References

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